Visualization of Therapeutic Ultrasonic Beams using Fringe Patterns-based Background-Oriented Schlieren Imaging and Hilbert Transformation

Sasono, Margi Visualization of Therapeutic Ultrasonic Beams using Fringe Patterns-based Background-Oriented Schlieren Imaging and Hilbert Transformation. Working Paper. UAD, FAST. (In Press)

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Abstract

Use of ultrasonic wave in medicals requires a safe treatment for human bodies (patients). The uncontrolled intensities of the ultrasonic sources cause ineffective treatment to the patient. The intensity as a main physical parameter have to be set and controlled accurately. So far, the hydrophone probe method provides a gold standard in providing the ultrasonic intensity visualization. However, this method has constraints such as time-consuming, intrusive, and off-axis measurements. In this letter, an optical method called background-oriented schlieren (BOS) imaging has been developed as an alternative to the hydrophone probe method. This optical method uses a background of fringe (line) patterns (similar to sinusoidal pattern) captured by a digital camera. The ultrasonic wave in the water displaces the fringe patterns relative to the background reference. A Hilbert Transform (HT) has been used to estimate the displacement of sinusoidal patterns proportional to the phase difference with a sinusoidal reference background, and reconstruct it as an ultrasonic intensity visualization. This letter reports that the developed BOS imaging capable of visualizing the ultrasound intensity (field) produced by a 1-MHz frequency therapeutic transducer operated in continuous-wave (CW) mode. The visualization results show a sinusoidal mode of the phase difference and the amplitude mode proportional to the ultrasound intensities. Thus, the developed BOS imaging is promising to be used as a calibration device of ultrasound beams or accuracy assessment to ensure patient safety in medicals.
Keywords: Visualization, Ultrasonic, Fringe, Schlieren, Imaging, Hilbert

Item Type:	Monograph (Working Paper)
Subjects:	Q Science > QC Physics
Divisi / Prodi:	Faculty of Applied Science and Technology (Fakultas Sains Dan Teknologi Terapan) > S1-Physics (S1-Fisika)
Depositing User:	Mr Margi Sasono
Date Deposited:	06 Feb 2025 02:46
Last Modified:	06 Feb 2025 02:46
URI:	http://eprints.uad.ac.id/id/eprint/79766

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